Old but gold – Antia and Buch chondrocutaneous advancement flap for helical reconstruction: a series of cases

The auricle or pinna is a frequent target of malignant neoplasms. Half of the tumors are located in the helix, and many defects involve both skin and cartilage, making surgical reconstruction a challenge. In this article, the authors describe three cases of skin neoplasms in the helix repaired with Antia and Buch chondrocutaneous advancement flap. Table 1 describes step-by-step the technique. The first patient presented an in situ squamous cell carcinoma (SCC), measuring 13 mm in its largest diameter, submitted to Mohs micrographic surgery (MMS) and removed in the first stage. The second patient had an infiltrative basal cell carcinoma (BCC), measuring 8 mm in its largest diameter, removed in 2 stages, using MMC. Finally, the third case was a well-differentiated SCC, measuring 10 mm in its largest diameter, resected using the conventional technique (Fig. 1). Surgical planning is essential to attain good results in the management of tumors in the auricular region. Among its peculiarities, a significant amount of cartilage is present which may not resist distortions secondary to scar contracture. Additionally, there is an increased risk of necrosis due to the thinness of the auricular skin. In the case of the helix, the choice of repair is based on the location, size of the defect, and the amount of cartilage loss. Small defects (<1--1.5 cm) are easily reconstructed with wedge excision and primary closure, unlike larger defects, which require the use of grafts or flaps.

The auricle or pinna is a frequent target of malignant neoplasms. Half of the tumors are located in the helix, and many defects involve both skin and cartilage, making surgical reconstruction a challenge. 1 In this article, the authors describe three cases of skin neoplasms in the helix repaired with Antia and Buch chondrocutaneous advancement flap. 2 Table 1 describes step-by-step the technique.
The first patient presented an in situ squamous cell carcinoma (SCC), measuring 13 mm in its largest diameter, submitted to Mohs micrographic surgery (MMS) and removed in the first stage. The second patient had an infiltrative basal cell carcinoma (BCC), measuring 8 mm in its largest diameter, removed in 2 stages, using MMC. Finally, the third case was a well-differentiated SCC, measuring 10 mm in its largest diameter, resected using the conventional technique ( Fig. 1).
Surgical planning is essential to attain good results in the management of tumors in the auricular region. Among its peculiarities, a significant amount of cartilage is present which may not resist distortions secondary to scar contracture. Additionally, there is an increased risk of necrosis due to the thinness of the auricular skin. In the case of the helix, the choice of repair is based on the location, size of the defect, and the amount of cartilage loss. Small defects (<1---1.5 cm) are easily reconstructed with wedge excision and primary closure, unlike larger defects, which require the use of grafts or flaps.
Grafts require a preserved cartilaginous structure, with viable perichondrium or cartilage perforations to allow irrigation through the contralateral bed. In composite defects, the structural loss of the helix margin requires cartilage and skin for its repair, which can be performed using the following techniques: composite graft from the contralateral auricle; interpolated flaps using cartilage; chondrocutaneous flap. 1,3---5 The latter is frequently used and can be performed through a skin incision on only one surface of the ear and cartilage, as described by Antia and Buch, or through a full-thickness incision including the skin of the two surfaces and cartilage (Fig. 2).
The chondrocutaneous flap was first described by Antia and Buch, in 1967. The principle of the procedure is to advance the skin and cartilage of the intact portion of the helix adjacent to the defect, based on a wide and secure retroauricular pedicle, with greater preservation of the vascularization of the posterior auricular artery. 2 However, the classic technique has lost prominence since the initial report ଝ Study conducted at the Dermatology Service, Hospital Santa Casa de Curitiba, Curitiba -Paraná, Brazil.  Therefore, Antia and Buch flap, despite having been described more than 50 years ago, maintains its role among the techniques of helix reconstruction, and its knowledge is important for dermatological surgeons. It is an effective and safe method, performed in a single step with the additional advantage of preserving local vascularization, reducing the risk of necrosis.

Financial support
None declared.

Authors' contributions
Paula Hitomi Sakiyama: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; critical review of the literature; critical review of the manuscript.

Conflicts of interest
None declared.